Championship side Millwall host Premier League side Brighton on Sunday.
VAR cameras are installed at all Premier League grounds, so the facilities are used by the FA during their Cup games.
"The most incredible thing after what we achieved last season is in this stage we are fighting for everything".More news: New Zealand mosque shootings kill 49 in what PM calls 'terrorist attack'
"That's important because for the future, for the new players and managers who are coming, they will learn from this group of players, and this group of people, that we never give up and fight for every single game and title until the end".
The win saw City keep their hopes of winning a famous quadruple alive, though Guardiola is not getting carried away thinking about such achievements.
City piled on the pressure in the second half and Bernardo Silva halved the deficit after 69 minutes before Aguero's penalty hit a post and rebounded off goalkeeper Kristoffer Nordfeldt and then City snatched a late victor.
Swansea players were unhappy when Cameron Carter-Vickers was judged to have tripped substitute Raheem Sterling for the equaliser, while Sergio Aguero was offside when he headed in the victor two minutes from the end.More news: Johnny Manziel signs with AAF, report says
Secondly, if it's a penalty or offside like the people say then I'm sorry.
Swansea said the club was set up to use VAR given their history of being in the Premier League between 2011 and 2018.
Speaking on Match of the Day, former England captain Alan Shearer said: "It is very wrong and very unfair".
But a club spokesman said the Football Association told them that VAR would not be used at the Liberty Stadium, even though it was in operation at other quarter-final ties around the country.More news: Amazon Fireplace TV lastly will get Apple Music streaming
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